.page-shell {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "topbar"
    "main";
  min-height: 100vh;
}

.topbar   {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: 0 var(--sp-5) 0 var(--sp-8); /* left clears the fixed ☰ toggle */
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}
.topbar h1,
.topbar__title {
  margin: 0;
  font-size: var(--text-md);
  font-weight: 600;
}
.topbar__actions {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
}
.topbar > :last-child { margin-left: auto; }
.sidebar  { display: contents; } /* sidebar is a fixed overlay; don't reserve a grid column */
.main     { grid-area: main; padding: var(--sp-5); overflow-y: auto; position: relative; }

.bento {
  display: grid;
  gap: var(--sp-4);
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.bento--2 { grid-template-columns: repeat(2, 1fr); }
.bento--3 { grid-template-columns: repeat(3, 1fr); }
.bento--4 { grid-template-columns: repeat(4, 1fr); }

.bento-span-2 { grid-column: span 2; }
.bento-span-3 { grid-column: span 3; }
.bento-row-2  { grid-row: span 2; }

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
  box-shadow: var(--shadow-card);
  transition: border-color var(--t-base);
}
.card:hover { border-color: var(--border-focus); }

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}
.card__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}
.card__value {
  font-size: var(--text-2xl);
  font-weight: 300;
  font-family: var(--font-mono);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
}

@media (max-width: 768px) {
  .page-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }

  .sidebar {
    display: none;
  }

  .topbar {
    padding: 0 var(--sp-4);
    padding-top: var(--safe-top);
    min-height: calc(52px + var(--safe-top));
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--sp-3);
  }

  .main {
    padding: var(--sp-4);
    padding-bottom: calc(var(--nav-bottom-h) + var(--safe-bottom) + var(--sp-4));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .bento,
  .bento--2,
  .bento--3,
  .bento--4 {
    grid-template-columns: 1fr;
    gap: var(--sp-3);
  }

  .bento-span-2,
  .bento-span-3 {
    grid-column: span 1;
  }

  .bento-row-2 {
    grid-row: span 1;
  }

  .card {
    padding: var(--sp-4);
    border-radius: var(--r-md);
  }

  @media (min-width: 480px) {
    .bento--3,
    .bento--4 {
      grid-template-columns: repeat(2, 1fr);
    }
  }
}

.bottom-nav {
  grid-area: bottom-nav;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--nav-bottom-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--bg-surface);
  box-shadow: var(--shadow-bottom-nav);
  display: none;
  align-items: flex-start;
  justify-content: space-around;
  z-index: var(--z-sticky);
}

.bottom-nav__item {
  display: flex;
  flex: 1;
  min-width: var(--touch-min);
  height: var(--nav-bottom-h);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--text-muted);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition: color var(--t-fast), opacity var(--t-fast);
}

.bottom-nav__item.is-active { color: var(--accent); }
.bottom-nav__item:active { opacity: 0.7; }
.bottom-nav__icon { font-size: 22px; line-height: 1; position: relative; }
.bottom-nav__label { font-size: 10px; font-weight: 500; letter-spacing: 0.02em; }

@media (max-width: 768px) {
  .bottom-nav { display: flex; }
}